US4759429A - Wedge and roller brake actuator - Google Patents

Wedge and roller brake actuator Download PDF

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Publication number
US4759429A
US4759429A US07/018,410 US1841087A US4759429A US 4759429 A US4759429 A US 4759429A US 1841087 A US1841087 A US 1841087A US 4759429 A US4759429 A US 4759429A
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US
United States
Prior art keywords
wedge
actuating
actuator according
abutment surface
tappet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US07/018,410
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English (en)
Inventor
Hugh G. Margetts
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Meritor Inc
Original Assignee
Lucas Industries Ltd
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Assigned to LUCAS INDUSTRIES PUBLIC LIMITED COMPANY, GREAT KING STREET, BIRMINGHAM, B19 2XF, ENGLAND reassignment LUCAS INDUSTRIES PUBLIC LIMITED COMPANY, GREAT KING STREET, BIRMINGHAM, B19 2XF, ENGLAND ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MARGETTS, HUGH G.
Application granted granted Critical
Publication of US4759429A publication Critical patent/US4759429A/en
Assigned to MERITOR AUTOMOTIVE, INC. reassignment MERITOR AUTOMOTIVE, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LUCAS INDUSTRIES PLC
Assigned to ARVINMERITOR, INC. reassignment ARVINMERITOR, INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: MERITOR AUTOMOTIVE, INC.
Assigned to JPMORGAN CHASE BANK, NATIONAL ASSOCIATION, FOR ITSELF AND AS ADMINISTRATIVE AGENT FOR THE LENDERS reassignment JPMORGAN CHASE BANK, NATIONAL ASSOCIATION, FOR ITSELF AND AS ADMINISTRATIVE AGENT FOR THE LENDERS SECURITY AGREEMENT Assignors: ARVINMERITOR, INC.
Anticipated expiration legal-status Critical
Assigned to MAREMOUNT CORPORATION, EUCLID INDUSTRIES, LLC, MOTOR HEAVY VEHICLE SYSTEMS, LLC, ARVINMERITOR TECHNOLOGY, LLC, MERITOR TECHNOLOGY, LLC, ARVINMERITOR OE, LLC, MERITOR TRANSMISSION CORPORATION, GABRIEL RIDE CONTROL PRODUCTS, INC., ARVIN TECHNOLOGIES, INC., ARVINMERITOR, INC., MERITOR HEAVY VEHICLE SYSTEMS, LLC, AXLETECH INTERNATIONAL IP HOLDINGS, LLC reassignment MAREMOUNT CORPORATION RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/58—Mechanical mechanisms transmitting linear movement
    • F16D2125/66—Wedges

Definitions

  • This invention relates to a wedge and roller actuator, primarily for a vehicle brake, being of the general kind in which the wedge is disposed between opposed tappets and rollers are arranged respectively at either side of the wedge to transmit thrust from the wedge to the tappets for actuation of braking elements engaged by the tappets.
  • the invention also embraces a brake incorporating such an actuator.
  • the wedge is allowed to float transversely of its actuating direction.
  • the wedge actuating force remains constant, the difference in drum servo effect on the leading and trailing shoes results in the wedge moving towards the leading shoe, giving rise to unequal tappet travel and uneven shoe wear.
  • the wear rate of the leading shoe is normally about three times that of the trailing shoe.
  • An object of the present invention is to provide a wedge and roller actuator of simple and convenient construction in which this problem is alleviated or avoided.
  • a wedge and roller actuator comprises a wedge disposed between opposed tappets, thrust rollers disposed respectively at either side of the wedge to transmit actuating thrust from actuating surfaces of the wedge to actuating surfaces of the tappets, at least one of said thrust rollers being also in force transmitting relationship with a fixed abutment surface in order to transmit to that surface inwardly directed forces arising on the tappet associated with the other roller.
  • the actuator of the invention When the actuator of the invention is incorporated in a shoe drum brake of leading/trailing shoe configuration, it can be arranged so that inwardly directed forces arising on the trailing shoe, which in a conventional actuator can lead to unequal tappet travel and the aforesaid resultant ill effects, are transmitted by the appropriate thrust roller for reaction at the fixed abutment surface so that the wedge is constrained to perform a substantially linear actuating travel and thereby increase the load applied to the trailing shoe tappet.
  • said abutment surface diverges from the line of action of the wedge, said abutment surface and the adjacent actuating surface of the wedge being preferably divergent.
  • the angles of inclination of the abutment surface and the adjacent tappet actuating surface may be different, the angle of said adjacent tappet surface then being conveniently greater than, and typically twice, that of the abutment surface.
  • angles of inclination of said abutment surface and the opposed wedge surface are equal.
  • FIG. 1 is a longitudinal cross section of a further alternative form of the actuator of the invention
  • FIG. 2 is a cross section along the line D--D of FIG. 1, and
  • FIG. 3 is a diagrammatic representation of the actuator of FIGS. 2 and 3 illustrating some theoretical values.
  • the actuator shown therein has a body 1 having a through bore 2 and a transverse bore 3 extending at right angles to the bore 2.
  • the bore 2 contains a pair of opposed tappets 4 and 5 disposed respectively in portions 2A, 2B of the bore 2 at either side of the bore 3, the tappets being normally engaged, in use, with respective brake shoes in a brake incorporating the actuator, for the purpose of applying brake actuating forces to the shoes.
  • Such forces are applied to the tappets 4 and 5 by means of a wedge device 6 which includes a wedge 7 fast with and reciprocal by means of an actuating rod 8, the wedge being located between a pair of rollers 9, 10 which would normally be carried by a cage (not shown) mounted on the rod 8.
  • the body Adjacent to the tappet 5, the body has an insert 11 secured therein providing an abutment surface 11A engaged by the roller 10 which also engages the actuating surface 5A of the tappet 5 and an opposed actuating surface 7A of the wedge.
  • a single thrust roller is provided at either side of the wedge for transmitting thrust to the tappets. It would, however, be possible to provide a plurality of such rollers at either side of the wedge, depending upon the sizes of the wedge and tappet actuating surfaces and the actuating thrust to be transmitted. In such an arrangement some or all of the thrust rollers at at least one side of the wedge are in thrust transmitting relationship with the abutment surface.
  • the abutment surface 11A and the opposed wedge actuating surface 7A are divergent, being preferably inclined, as shown, at the same angle relative to the line of action of the wedge, represented by the arrow A.
  • the abutment surface 11A may alternatively be formed directly on the housing 1, should manufacturing techniques permit this.
  • the roller 9 engages the wedge actuating surface 7B and opposed tappet actuating surface 4A.
  • the tappets 4 and 5 are expanded for brake actuation by moving the wedge along its line of action A within the bore 3, in order to apply outward force to the tappets via the interposed rollers 9 and 10 engaged between the tappet and wedge actuating surfaces. Any force arising on the wedge 7 as a result of differing drum servo-action on the respective shoes is reacted via the roller 10 against the abutment surface 11A.
  • the wedge is thereby constrained to move in a substantially linear manner and the tendency found in some conventional brakes for unequal tappet travel as a result of the aforesaid servo-action is reduced or substantially eliminated.
  • the invention achieves this in a particularly simple and convenient manner by using at least one of the two thrust rollers (9, 10) to transmit to the abutment surface inward forces on the opposed tappet, thereby minimising the number of components required.
  • the preferred values of the angles of inclination of the various surfaces involved are enumerated in FIG. 3. From this it will be seen that the wedge is asymmetric, such that the wedge surface 7B which actuates the tappet of the trailing shoe via the roller 9 is inclined at 5.5° to the wedge axis A, whereas the opposed wedge face 7A is inclined at 3.67° to the wedge axis.
  • the angle of inclination of the reaction surface 11A in the opposite direction to that of the wedge surface 7A is also 3.67°
  • the inclined surface 5A of the tappet 5 against which the roller 10 is also engaged is inclined in the same direction as the wedge surface 7A, but at 7.33°.
  • the corresponding surface 4A of the tappet 4 is inclined in the same direction as the wedge surface 7B and at the same inclination as the latter, namely 5.5°.
  • the wedge actuating surfaces are both inclined at the same angle to the wedge line of action, with both tappet actuating surfaces parallel to the respective opposed wedge actuating surfaces.
  • the respective angles of divergence of the fixed abutment surface and opposed wedge surface are then equal.
  • a fixed abutment may be provided at each side of the wedge to react forces applied by the tappets in both directions.
  • One or both of the tappets may be provided with an automatic adjuster device of any conventional type.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
US07/018,410 1986-03-05 1987-02-25 Wedge and roller brake actuator Expired - Lifetime US4759429A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868605393A GB8605393D0 (en) 1986-03-05 1986-03-05 Wedge & roller brake actuator
GB8605393 1986-03-05

Publications (1)

Publication Number Publication Date
US4759429A true US4759429A (en) 1988-07-26

Family

ID=10594059

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/018,410 Expired - Lifetime US4759429A (en) 1986-03-05 1987-02-25 Wedge and roller brake actuator

Country Status (8)

Country Link
US (1) US4759429A (de)
EP (1) EP0240125B1 (de)
KR (1) KR870009155A (de)
BR (1) BR8700935A (de)
DE (1) DE3765281D1 (de)
GB (1) GB8605393D0 (de)
IN (1) IN169158B (de)
TR (2) TR23607A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5195386A (en) * 1991-11-20 1993-03-23 Tecumseh Products Company Brake lever arrangement
US5232072A (en) * 1991-02-12 1993-08-03 Hoesch Ag Center-free large roller bearing
KR20030072469A (ko) * 2002-03-04 2003-09-15 현대자동차주식회사 자동차의 웨지 드럼 브레이크
KR100466125B1 (ko) * 2002-10-29 2005-01-13 현대자동차주식회사 차량용 드럼 브레이크
US20130098720A1 (en) * 2011-10-19 2013-04-25 Mitsubishi Heavy Industries, Ltd. Brake device
US11000887B2 (en) * 2019-05-24 2021-05-11 The Boeing Company Apparatuses and methods for applying pressure to edge surfaces
US11007741B2 (en) * 2019-05-24 2021-05-18 The Boeing Company Apparatuses and methods for applying pressure to edge surfaces
US11014320B2 (en) * 2019-05-24 2021-05-25 The Boeing Company Apparatuses and methods for applying pressure to edge surfaces

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1848775A (en) * 1932-03-08 girling
GB1287980A (de) * 1970-01-15 1972-09-06

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3511103A (en) * 1968-07-09 1970-05-12 Rockwell Standard Co Brake mechanism
GB1509398A (en) * 1975-10-03 1978-05-04 Girling Ltd Automatic slack adjusters for vehicle brakes
DE2631704C3 (de) * 1976-07-14 1979-05-17 Deutsche Perrot-Bremse Gmbh, 6800 Mannheim Selbsttätige Nachstellvorrichtung für Innenbackenbremsen
US4519482A (en) * 1982-02-05 1985-05-28 Allied Corporation Wedge actuated drum brake assembly
GB8324942D0 (en) * 1983-09-17 1983-10-19 Lucas Ind Plc Actuator assemblies for vehicle brakes
SE455635B (sv) * 1985-05-10 1988-07-25 Garphyttan Haldex Ab Styranordning for en tryckstang till en bromscylinder vid ett kilbromsarrangemang

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1848775A (en) * 1932-03-08 girling
GB1287980A (de) * 1970-01-15 1972-09-06

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5232072A (en) * 1991-02-12 1993-08-03 Hoesch Ag Center-free large roller bearing
US5195386A (en) * 1991-11-20 1993-03-23 Tecumseh Products Company Brake lever arrangement
KR20030072469A (ko) * 2002-03-04 2003-09-15 현대자동차주식회사 자동차의 웨지 드럼 브레이크
KR100466125B1 (ko) * 2002-10-29 2005-01-13 현대자동차주식회사 차량용 드럼 브레이크
US20130098720A1 (en) * 2011-10-19 2013-04-25 Mitsubishi Heavy Industries, Ltd. Brake device
US8833528B2 (en) * 2011-10-19 2014-09-16 Mitsubishi Heavy Industries, Ltd. Brake device
US11000887B2 (en) * 2019-05-24 2021-05-11 The Boeing Company Apparatuses and methods for applying pressure to edge surfaces
US11007741B2 (en) * 2019-05-24 2021-05-18 The Boeing Company Apparatuses and methods for applying pressure to edge surfaces
US11014320B2 (en) * 2019-05-24 2021-05-25 The Boeing Company Apparatuses and methods for applying pressure to edge surfaces

Also Published As

Publication number Publication date
DE3765281D1 (de) 1990-11-08
EP0240125B1 (de) 1990-10-03
IN169158B (de) 1991-09-07
TR23690A (tr) 1990-07-01
TR23607A (tr) 1990-04-30
GB8605393D0 (en) 1986-04-09
EP0240125A1 (de) 1987-10-07
BR8700935A (pt) 1987-12-29
KR870009155A (ko) 1987-10-23

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